Apparatus pop



Oct. 9, 1928.

L. KIRSCHBRAUN APPARATUS FOR MAKING PAPER Original Filed 12, 1925 %&

?ateri.eci 1928.

LYNEEED STATES PATENT OFFICE."

LESTER KIRSCHBRAUN, OF CHICAGO, ILLINOIS.

APPARATUS FOR MAKING PAPER.

Original application filed November 4, 1921, Serial No. 512 808.

Divided and this application filed January 12, 1925, Serial No. 2,039.

proof or moisture-proof paper such for example, as is desired in themanufacture of air-tight or moisturetight containers.

This application is a division of application Serial No. 512,808 filedon November 4th, 1921, issued February 17th, 1925, No. 1,526,522.

I have heretofore invented numerous improvements in the art ofwaterproofing paper, in which an asphaltic or bituminous medium isincorporated in the fibrous stock as the stock is being formed into aweb on the usual types of paper-forming machinery. This is accomplishedby forming the asphalt into a non-adhesive emulsion of asphalt and waater, in which the water forms the external sion in question.

\Vhile by means of my prior processes above referred to I have producewaterproof paper which is impervious against water in a liquid phase,there has been more or less tendency for moisture in the form ofvaporladen air to pass through the paper.

The object of the present invention is to provide a novel apparatus forpreventing this. It is a further object of the invention to accomplishthis result in such a way as to be able to use the usual multi-cylindermachine for making paper in carrying out the process, with suchadditions as form the novel feature of the present apparatus.

In the present invention, I produce a con tinuous asphalt-i0 film whichis devoid or substantially devoid of any pores through which air canpass.

I have stated that the invention is carried out by making a non-adhesiveemulsion of asphalt, clay and water, but an invention can be carried oututilizing my basic idea in which instead of clay and asphalt, otheremulsifying agents, as for example soaps, casein, sulphonic acid, saltsor other agents may be used, and instead of asphalt other forms ofbitumens, hydrocarbons or pitchy material may be used all possessingwaterproofing qualities. An invention may be carried out using thisbasic idea in which Patent No. 1,526,522, dated February 17,

Renewed March 26, 1928.

the waterproofing constituent may perhaps not necessarily be in anon-adhesive form so long as it is not brought directly into contactwith any of the elements of the paper machine which would tend to gum upor interfere with the paper forming operation.

To more clearly understand the invention, I have drawn the accompanyingdrawing, in which Fig. l is a somewhat diagrammatic view of a part of amulti-cylinder paper machine, equipped with my invention.

Figs. 2 and 3 are diagrammatic plans of the spraying apparatus, by whichthe asphalt is applied to the fibrous web.

Referring to the drawings, 1 designates a vat containing cylinder mould2, on which is formed the fibrous web 3, carried by the underside of theblanket 4. 5 desig tites a sec- 0nd vat, containing the cylinder niould6, on

which is formed a second web 7. 8 and 9 designate couch rolls, 10 thesuction box, and 11 a series of press rolls, with which the usualmulti-cylinder machine is equipped.

Between the vats 1 and 5 is interposed a spraying device designated as awhole 12, consisting of a series of transversely disposed headers 13,each equipped with a plurality of upwardly extending atomizing nozzles14. The spraying device is equipped with suitably controlled valves (notshown), whereby any one or more of the manifold nozzles may be usedindependently of the other.

Above the vat 5 is suitably mounted a transversely disposed manifold 15,containing a plurality of atomizing nozzles 16, the nozzles beinginclined upwardly so as to pro- 'ect the waterproofing material into thenip etween the incoming ply and the cylinder mould.

By means of the apparatus shown, the emulsion may be sprayed eitherthrough the nozzles 14 across the entire face of the sheet so as toproduce a continuous film of any desired thickness, which film issubstantially pure bitumen in emulsified form free from a fibre. Also,if desired, a bituminous film may be formed by forcing the non-adhesiveemulsion through the nozzles 16; or, if desired, either the nozzles 16or the nozzles 14 may be used alone.

In order to facilitate the retention of the asphalt and to avoidinterference with the formation and couching of the sheet, it is desirable to carry the suction in the cylinder moulds as low as possibleto produce the dryest web capable of retaining the emulsion withoutdisturbance.

I have described the formation of two fibrous webs formed of paper stockonly united by a continuous film of non-porous bitumen. However, in somecases it may be desirable to make the webs themselves of bituminousstock, which may be accomplished by mixing the non-adhesive emulsionwith the pulp in each vat and between the webs formed of such stockinterpose the film of bitumen by means of the spraying devicesheretofore described. B using bituminous stock in this manner, thesprayed film of bitumen need not be so heavy, as the absorption of thebitumen into the paper plies is lessened on account of the presence ofthe bituminous stock.

I claim as my invention:

1. In an apparatus for producing a waterproof multi-ply fibrous sheet,the combination with spaced fibrous pulp vats, of cylinder molds adaptedto be rotated therein, and adapted to have suction applied thereto tocause a layer of fibrous pulp solution to felt on the surfaces thereof,a con inuous flexible web contacting and removing the felted layers fromsuccessive molds, and spraying means interposed bet-ween designatedmolds adapted to project waterproofing medium on the surface ofpredetermined fibrous plies.

2. In an apparatus for producing a waterproof multi-ply fibrous sheet,the combination with spaced fibrous pulp vats, of cylinadapted to havesuction applied thereto to cause a layer of fibrous pulp solution tofelt on the surfaces thereof, a continuous flexible web contacting andremoving the felted layers from successive molds, and awaterproofing-medium-projector positioned between designated cylindermolds.

4. In an apparatus for producing a waterproof multi-ply fibrous sheet,the combination with spaced fibrous pulp vats, of cylinder molds adaptedto be rotated therein, and adapted to have suction applied thereto tocause a layer of fibrous pulp solution to felt on the surfaces thereof,a continuous flexible web contacting and removing the felted layers fromsuccessive molds, and a waterproofmediumrojector positioned between desinated cy inder molds, comprising upward y pro ecting sprays.

5. In an apparatusfor producing a waterproof multi-ply fibrous sheet,the combination with spaced fibrous pulp vats, of cylinder molds adaptedto be rotated therein, and adapted to have suction applied thereto tocause a layer of fibrous pulp solution to felt on the surfaces thereof,a continuous flexible web contacting and removing the felted layers fromsuccessive molds, and a waterproofmedium-projector positioned betweendesignated cylinder molds, comprising upwardly projecting spraysarranged substantially transversely of the fibrous sheet.

6. In an apparatus for producing a waterproof multi-ply fibrous sheet,the combination with spaced fibrous pulp vats, of cylinder molds,adapted to be rotated therein, and adapted to have suction appliedthereto to cause a layer of fibrous pulp solution to felt on thesurfaces thereof, a continuous flexible web contacting and removing thefelted layers from successive molds, and spraying means interposedbetween designated molds adapted to project waterproofing medium on thesurface of predetermined fibrous plies, and means for pressing the pliestogether to form a sheet and means for drying the pressed sheet.

LESTER KIRSOHBRAUN.

